The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 18, 1991
Filed:
Dec. 29, 1989
Tomohiro Oikawa, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A polygonal mirror for use as a light beam deflector or scanner in an image exposure device includes a support on which a polygonal mirror body is mounted such that it is positionally limited thereby at positions near angular corners between mirror facets of the polygonal mirror. The polygonal mirror body may have a plurality of through holes defined therein on radial lines interconnecting said axis and said angular corners so that said polygonal prism body is subject to a substantially uniform moment of inertia about said axis upon rotation thereof. The holes may be filled with cores which are made of a material having a density smaller than the density of the material of which said polygonal prism body is made. Alternatively, a sheet of resin may be disposed on at least one of axially opposite surface of said polygonal prism body.